Abstract: In order to lock an implement to a belt, a locking system is provided having a main pin fixed to the belt, the main pin having a first groove therein, and a casing rotatably mounted on the main pin, the outer casing having a locating hole therein. The implement is thus locked to the belt by aligning the locating hole with the first groove; inserting a male pin to which the implement is attached into the locating hole to a position in which a second groove of the male pin is aligned with the first groove in the main pin; and rotating the male pin relative to the main pin such as to rotate the outer casing, until the second groove is not aligned with the first groove, whereby the male pin is held by the main pin in the casing, thereby to lock the implement to the belt.